Breaker fabric and method of preparing the same



April 29, 1930. w, K. SAWYER 1,756,069

BREAKER FABRIC AND METHOD OF PREPARING THE SAME Filed April 6, 1926 Patented Apr. 29, 1930 UNITED STATES WILLIAM K. SAWYER, OF DETROITLMICHIGAN, ASSIGNOR T0 MORGAN Ga WRIGHT,

PATENT OFFICE OFI DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN BREAKER FABRIC AND METHOD OF PREPARING- vTHE SAME Application led April 6,

This invention relates to a new and improved fabric for the manufacture of rubber goods, and more particularly a breaker fabrlc for incorporation intires and to the method of making the same.

Incident to the manufacture of tires by what is known as flat building process in which the constituent plies and stratums of rubber are assembled on a dat drum and subsequently transformed to approximately tire shape by bulging out the intermediate portion of the.pulley band carcass, it has been lstep of inflating or otherwise transforming0 from Hat to tire shape. Other objects and advantages of the invention will be apparent to one skilled in the art.

This application is a. continuation in part of applicants previously filed application Serial N o; 62 ,226, filed Feb. 20, 1923. s

This invention is illustrated in the accompanying drawings in which:

Figure 2 is an elevation of a cord of the same with the central core partially exposed or uncovered, and

4Figure 3 illustrates a method of wrapping the yarns around the central core.

Referring to the drawings the fabric indicated at 25 is shown composed of the warp threads 426 and filling threads 27. The fabric may bewoven in any suitable and convenient manner. The cords shown-in Figures 2 and 3 may re resent either the warp or the` illingthread or both, as the capacity to increase in dimension may be desired either or both lengthwlse and crosswlse the fabric.

Figure 1 is a planv view of a breakerv fab.

192,6. Serial No. 100,170.

Each cordas shown in Figures 4 and 5 comprises a central core 28 which may be made of a central yarn or a plied yarn about which central core are wrapped'spirally one or more yarns 29, preferably a plurality as shown in Figure 5, the pitch of which may be varied to control the capacity thereof to elongate beyond its normal length.

After the fabricis woven or otherwise associated in the form of a strain resisting fabric, it has applied to it vulcanizable rubber composition. The composition may be applied by dipping, calendering, or in any'other manner suitable and convenient to the manufacturer of the articles. During the treatment of the fabric it is subjected to stresses which it is the function of this invention to have borne by the central core 28. And this central core 28 may be of any suitable-construction suicient to furnish this requisite strength and preferably of no greater 'strength than necessary to permit application l of the rubber to the fabric.

After the fabric has been rubberized, it may be built into the tire or other article, but preferably in order to get uniform results, the fabric is first subjected to strain in one o: both directions, as may be required in order to straighten out the cords of the fabric. For

this purpose any suitable and convenient apparatus may be employed.

Having treated the fabric with rubber solution or suspension, and having stretched the fabric after this treatment, and subsequently drying the treated stretched fabric, the latter is then skim-coated with rubber in the 4usual manner, the rolls of the calender traveling at equal surfacespeeds in order to prevent distortion of the fabric.

The central core 28 is made strong enough to withstand the stresses incident to stretching the fabric as described and also the strains such as it is subjected to in passing throu h the calender. This core is not det signe to be'strong enough to withstand the lOC cass.- When the core breaks, instead of having a defective breaker strip as would happen the filling portion of the fabric, depending the finished article.

upon the direction taken by the stresses in If the stretch desired is yin longitudinal direction, and very little stretch is desired across the fabric then only the longitudinal cords need'contain the cen` tral core with the spiral wrappings. The tenter device in this case need exert only a longitudinal ull. Y Again, if the desired stretch in the nal article is to be lateral only, then only the lateral cords need -contain the central core and spiral wrappings qn the core.

Another type of fabric within the scope of the invention. in' its broadest sense is woven on the bias. 'Instead of treating the fabric with a solution of rubber, it may be frictioned with rubber on a calendar whose rolls travel at differential surface speeds. In this case, the central cores of the cords must be strong enough to withstand the grindingor wiping caused by the calendar rolls'.

Having thus described my invention what I claim and desire to protect by Letters Patent is:

1. A fabric for incorporation in rubber articles having each cord consisting of an inelastic easily ru turable central element of sufficient stren' only for resistingstresses v incident to ru berizing and preparing the article and a covering yarn wound spirally` thereabou't for holding the fabric together upon rupture of the central element in theA finished rubber articles,.said fabric being impregnated with rubber.

2. A fabric for incorporation in rubber articles subject to strain the cords of which are composed of an easily rupturable core of relatively weak and inextensible `fibrousA mate` rial surrounded by a stronger and exten: Lble fibrous sheath.

3. A fabric for incorporation in rubber articles subject to strain the cords of which are `composed of an easily rupturable core of relatively weak and inextensible fibrous material surrounded by a stronger and extensible spirally wound fibrous sheath.

4. A fabric for incorporation in rubberarticles subject to strain composed of a warp and weft, at least one of which is formed of cords provided with an easily rupturable core of relatively weak and inextensible brous material surrounded b a stronger and extensible s irally wound fi rous sheath.

5. A rub r article having incorporated therein fabric comprising cords having an easily rupturable central fibrous core and a stron sheath of longitudinally extended spira y wound yarn..

6. A rubber article having incorporated therein breaker fabric composed of a warp and weft, at least one of which is formed of cords provided .with an easily" rupturable fibrous core surrounded by an extensible sheath of spirally wound yarn.'v

Signed at Detroit, in the county of Wayne and State of Michigan, this 23rd day of 80 March, 1926.-

WILLIAM K. SAWYER.

CERTIFICATE OF CORRECTION.

Patent No. 1,756,069. Granted April 29, 1930, to

WILLIAM K. SAWYER. i

It is hereby certified that error appears in the printed specification of the abovevnumbered patent requiring correction as follows: Page 1, line 14, strike out4 the word "materially"; same page, line 51, for "Figures 4 and 5" read "Figures 2 and 3"; and that the said Letters Patent'should be read with these corrections thereinthat the same may conform to the record of the case in the VPatent Office. I

Signed and sealed this 22nd dayr of July, A. D.` 1930.

, Wm. A. Kinnan, (Seal) v Acting Commissioner of Patents. 

